Stay-bolt.



W. M. SMITH.

STAY BOLT. I APPLICATION FILED FEB. 20, 1909.

Patented Aug. 10, 1909.

b I INVENTOR WZk'amflSmzZk.

Attorney 1 no. ceases.

s OFFFJE W M M. SMITH; 0F TURTLE CREEK, PENNSYLVANIA. I sway-near;

Persians Aug. 1h,- 11509;

To all whoinit may concern; I Be it known that: 1:, WILLIAM M. SMITH,

a citizenv of the United States, residin" at Turtle treek, inthe countyof Allegheny and State bf lennsylvania, have invented certain new and.useful Improvements in StavBolts, fica-tiion. y

p This invention relates to that class of stay of which the following isa specibolts w'hichare used for the purpose of staying sheetsofflocornotive and other steam boilers and" the object thereof, is to,provide a stay boltwithineans at each end thereof whereby a steamtigl'it' connection is bad between the boiler sheetand the ends of thebolt and furthermore whereby the necessary degree of flexibility for theboltis obtained to overcome breakage of-the bolt due to expansion of theboiler sheets when building up the tire or to high pressure steam.

Further objects of the invention are to. a provide a flexible stay boltwhich shall be simple in its construction strong, durable,

efficient in its use, readilyiset up and inexpensive to manufacture:

With the foregoing and other object sin view the-'inventionconsists ofthe novel con-- struct-ion, combination and arrangements of partshereinafter more specifically describedand illustrated in theaccompanying draw ings wherein is shown the preferred embodimentof theinvention, but it'is to be understood that changes variationsand-modifications can be resort ed to which come within the scope ofthe'claiins hereunto appended.

In the drawings, wherein like reference characters denote correspondingparts throughout the several views, Figure 1 is a-side e levatiom-partlyin section, of a flexible stay bolt in accordance with this inventionshdwing the adaptation thereof in connection with the inner and outersheets of.

a boiler. Fig. 2 is a view-similarto Fig. 1 of a modification, and, Fig.3 is aside elevation' of, the shank employed in connection with the formshown' in Fig; 2, the shank being-broken intermediate its ends. p

In connection with a stay bolt in accordance with this invention eitheror bothyends thereof when a boiler sheet'or sheets expand, movelaterally,lthat is to say the direction of movement of. the bolt" at{one or both of its ends is vertical Qr-Latfrightr-angIeS with respectto the expansive movement of the sheet or sheets.

Referring to Figs. 1 and 2 ofthe drawa plication filed February 20,1909. seen-no. 479,132.

ii 1gs,'-3denotes the'outer sheet of the boiler and 4=the1inn'er sheet,each of said sheets is formed with openings 5, the openingsof one sheetbeing arranged opposite the openings of the other sheet and the-walls oftheo'penings are formed withscrew-threadsi.

Referring to Fi 1 of the drawings the shank 6f the bolt is'indicated by'therefer ence character 6"and at one end is formed with anintegraF-head 7 and at its' pther end with a removable head 8'. That endof the thank 6 whi h-is provided'with'the removable head 8 is' threadedas at 9, the said I threads engaging with the interior threads of theremovable head 8, the latter' beingin the form of'a' cap. The fixed head7 as well as the removable head 8 has formed on itsf inner terminus anannular flange 10 having the periphery thereof rounded: The flange '10is flaredand projects to such an extent as to be positioneai in a planeinwardly-o'fthe planetin which the inner face 11 of either of the "headsextends. -The Width of the flange- 10 in cross section is less than thewidth of the inner face 11' of' either of the heads. The inner face 11of either of-itheheads of the bolt is'rounded and constitutes a seat forthe-terminus 'of a flange to be hereinafter referred'to. Secured to theboiler sheet 3 is a tapering plug 12, which extends through the opening5 and engages with the threads of the wall of said opening. For suchpuradapted to receive t e immovable head 8:

of the-"bolt: Secured to the sheet .i'is a.

tapering-plug 18 'for-'th e= reception of the thepliig 1,8 isconstructed" in the sarne mannet" as the inner' endof'the plug :12, thesame reference "characters being applied thereto. The plug 18 is securedto thesh'eet 4 in, the same manner as the plug 12 and is also closed bya cap 19.

Bv the foregoing construction and ar .rangement of; parts it is evidentthat; if

either of theboiler sheets expand, the bolt will shift laterallywing=,to the width of the flanges with respect'to'the seats 16 and thewidth of the flange with respect to,

the width of the'inner face 11, under such conditions the necessaryflexibility is obtained for the bolt to prevent breakage thereof whenthe sheets expand,

In the construction shown in Figs. Qand 3, the shank of the bolt isindicated by the reference character 20 and each end is screwthreaded.as at2l" to receive a removable .head 22. The construction of each ofthe head'si22 .is similarto that of the head 8 and like referencecharacters are applied thereto.-. Thenlorhrof bolt shown in' F1gs.-&

. and 3 is nioun 'ted'in the same manner as thebolt'shown in Fig. 1,likereference charac-..

ters beiitg applied;

' B providing .the removable head at one end or at both ends, it isevident that provision is' made whereby the length of that portion ofthe shank which is arranged within tliegboiler. can be increasedordiminished as'desird. "The removable head or heads. is or are squaredat the outer end or ends so that therelhdvable head or heads can beadjusted'by hand or by a suitable tool.

.What I claim is: Y J I '1. A flexible staybolt comprising a shankhaving each end prfovided with a head, each a hearing, combined withmeans for coupling the bolt to the boiler sheet, said means formed with.bearings associated with said flan' es. I -,f-

4. A flexible .staymeans for boiler sheets comprising a pair of plugs.ada ted to be secured to opposite sheets of a oiler and each having itsinner end inturned to provide a flange and aseat, and a b0lt com--prising a shank having each end provided with a head, each of said headsformed with a flange and having its inner face constituting a bearinthe. bearings formed by the inner faces 0 the heads associating withthe" 5. A fiexible stay means for boiler sheets comprising a pair' ofplugs adapted to be secured to opposite sheets of a boiler and eachhaving its inner end inturned to provide a flange and a seat, and a boltcomprising a shank having each end provided with a head, each ofsaidheads formed with a flange and having its inner face constituting abearing, the bearings formed by the inner faces of i the headsassociating with the flanges of the plugs and the flanges associatingwith the seats of the plugs, one of said heads being adjustablyconnected to the shank.

6. A flexible stay"1 1'1eans for boiler sheets. comprising a pair of:plugs adaptedto be secured to opposite sheets of a boiler and eachhaving its inner end inturned to provide a flange and asset, anda boltcomprising a shank having eachend provided with a, head, each ofsaidheads formed with a flange and having'its'inner face constituting abearin the bearings formed by the inner faces of t is heads associatingwith the flanges of the plugs'and the flanges associating with the seatsof the plugs, the flanges of each of the heads in cross section beingofless width than the inner faces of the head between the flange andthejunction of the inner face of the head with the shank and the innerface of each of the flanges of the plugspf less width in cross sectionthanthe widthof the seat formed by the inturncd end of the plug. a

7. A flexible stay means for boiler sheets comprising a pair of plugsadapted to be secured to opposite sheets of a boiler and each having itsinner endinturned to proride a flange and a seat, and :1 bolt comprisinga shank having each end provided with a head, each of said heads formedwith a flange and having its inner face constituting a bearing, thebearings formed by the inner faces of the heads associating with theflanges of the ,plugs and the flanges associating with the; seats of theplugs, the flanges of each of the heads in cross section being of lesswidth than the inner faces of the head between the flange and the junc--tion of the inner. face of the head with thm shank and the inner-faceof each of the flanges of the plugs of less width in cross section thanthe width of the seat formed by the inturncd end of-the )lug, one ofsaid heads adjustably connected to the shank.

In testimony whereof I affix my signature,

in presence of two Witnesses.

VILLIAM hi. SMlTH. Witnesses: I

flanges of the plugs and the flanges associsting with the seats of theplugs.

A. M. VVILsoN, N. LOUIS BOGAN.

